refactor(drupal): reorganise templates

templates/drupal/.env.example.twig

@@ -0,0 +1,20 @@
+# {{ managedText|raw }}
+
+export DOCKER_UID=1000
+
+{% if dockerCompose %}
+export COMPOSE_PROJECT_NAME={{ name }}
+export COMPOSE_PROFILES=web,php,database
+
+export DOCKER_WEB_VOLUME=.:{{ project_root }}
+{% endif %}
+
+{% if experimental.useNewDatabaseCredentials %}
+export MYSQL_DATABASE=app
+export MYSQL_PASSWORD=app
+export MYSQL_USER=app
+{% else %}
+export MYSQL_DATABASE=drupal
+export MYSQL_PASSWORD=drupal
+export MYSQL_USER=drupal
+{% endif %}